The End of Line Club was a nightclub in Tron City, emceed by Castor, a flamboyant and vivacious program. It is one of the many energy clubs found on the Grid. The club was located on top of the tallest tower overlooking the city, and was accessed by way of a windowed elevator car on the outside of the structure. Inside the club was a main entertainment room whose central bar was illuminated with a steady white glow. A booth overlooking the area provided a live entertainment music suite in which the Masked DJs performed their music. Stairs led up from the entertainment room to Castor's personal lounge/bar area, with more privacy than the dance floor and wide windows to offer views of the surrounding city and sky.

The End of Line Club was a well-known social hotspot where programs could find anything they wanted, from drinks and a non-stop dance party to company and relaxation. While most patrons were programs looking for a social gathering, faction leaders would also congregate at the club, conspiring or seeking audience with Zuse. One such program was Bartik, who represented an underground rebellion against Clu.

In the game TRON: Evolution, Anon and Quorra visited Zuse at the first End of Line Club, but were forced to escape when it was attacked by The Regulator. The original End of Line Club was an ISO-safe haven, and its destruction marked the beginning of the Purge.